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Control algorithm of electronic braking force distribution based on deceleration parameters |
State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China) |
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Abstract Based on the two-wheel vehicle model, the principle of electronic braking force distribution(EBD) using peak tire-oad friction coefficient was analyzed. The relationship between road friction coefficient and wheel peak braking force was studied and the braking force distribution coefficient was determined aiming at maximal rear wheel peak braking force. Difference between real and target decelerations of vehicle was discussed when front or rear wheel worked at peak braking force. EBD control algorithms using vehicle and wheels deceleration parameters were proposed and corresponding EBD processes were developed. EBD function is integrated and tested with self-developed anti-lock braking system(ABS). The results show that the braking force distribution curve of front and rear wheels simultaneously working at peak tire-road friction coefficient φp is the same as the I-curve of front and rear wheels simultaneously being locked. There exists a maximum peak braking force of rear wheel under fixed load and it changes little in a certain range of φp. EBD can effectively adjusts rear wheel braking force before ABS functions.
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